10 Best Portable Greenhouse Heaters 2025 in the United States

The Dr Infrared Heater DR-268 is a solid choice for those seeking a portable greenhouse heater. With its heating capacity of up to 1500W, it effectively warms areas of 150-200 square feet, making it suitable for greenhouses, garages, and sheds. One of its standout features is the built-in digital thermostat, which allows for precise temperature control, ensuring that your plants stay at the right temperature without wasting energy. User-friendly features like the digital display and selectable Auto or Manual modes also make operation straightforward, even for those who aren't tech-savvy.

Safety is a priority with this heater, as it includes features like overheat protection and is designed to be water-resistant (rated IPX5), allowing it to be used both indoors and outdoors without worrying about damage from moisture. Its construction from dual layers of aluminum helps retain heat effectively, making it especially useful in colder environments.

There are some considerations to keep in mind. The heater requires assembly and, while it has multiple mounting options, it may not be as easy to reposition once installed. Additionally, while it’s energy efficient, being electric means it will add to your electricity bill, especially with continuous use. Lastly, with a one-year limited warranty and USA-based customer support, users can feel secure about their purchase. This heater is particularly suited for gardeners and growers looking for a reliable, versatile heating solution that can easily adapt to different spaces and conditions.

The TRUSTECH Greenhouse Heater is a compact electric heater ideal for small indoor spaces like greenhouses, grow tents, garages, or patios up to about 160 square feet. It offers a decent heating capacity of 1500 watts with three modes: low heat (750W), high heat (1500W), and fan-only, allowing you to adjust warmth as needed. The digital thermostat with a waterproof sensor probe stands out by letting you precisely set temperatures from 40°F to 108°F, which helps maintain a stable environment for plants or comfort in a workspace.

Safety is well-covered with flame-retardant materials, overheat protection, and a reliable thermostat controller, so you can run it safely without constant supervision. Energy efficiency is supported through automatic thermostat regulation that switches the heater on and off to save power while keeping temperature steady, which is useful for reducing electricity bills. Portability is another strong point—the heater weighs just under 5 pounds, includes a sturdy handle, a non-slip base, and a long 7.5-foot power cord, making it easy to move and place where needed.

A minor downside is that it's designed primarily for indoor use and smaller spaces, so it might not be sufficient for larger greenhouses or outdoor areas. Also, being electric, it requires access to a power outlet, limiting where it can be used. This heater is well suited for gardeners or hobbyists looking for an easy-to-use, safe, and efficient way to maintain warmth in smaller indoor plant environments or personal spaces.

The VIVOSUN Portable Greenhouse Heater is a compact and versatile electric heater designed for small spaces like greenhouses, grow tents, patios, and more. It offers two heat settings—750W and 1500W—and a fan-only mode, which makes it useful throughout different seasons for both heating and air circulation. The heater warms up quickly, within about 3 seconds, and has a thermostat control that can handle spaces up to around 160 square feet, which fits well for most personal greenhouse setups or small outdoor areas.

Safety-wise, it includes overheat protection and is made with flame-retardant materials, which provides peace of mind during use. The design also includes a bracket to keep it off the ground and a 90° rotating feature to spread heat more evenly. With an IP20 dustproof rating, it offers some protection against dust and moisture, though it's not fully waterproof, so it’s better suited for covered or semi-indoor spots rather than open rain exposure.

Portability is a big plus here—the heater is lightweight (under 4 pounds) and has a built-in handle, making it easy to move around where needed. Its compact size won’t take up much space, which matters in small grow tents or tight areas. Being electric, it requires a power outlet but avoids fuel smells or emissions, making it cleaner for indoor use. While the heater is energy-conscious in its quick heating and adjustable modes, running it on the higher 1500W setting can increase electricity use, and the lack of a waterproof rating limits outdoor use in very damp environments. This VIVOSUN model is a suitable choice for those looking for a portable, easy-to-use heater to quickly warm small grow spaces with safety features and simple controls, but it is less ideal for larger greenhouses or fully outdoor use exposed to weather.